[Bug target/121489] New: -march accepts invalid version numbers for extensions on riscv64-linux-gnu

[doko at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121489

            Bug ID: 121489
           Summary: -march accepts invalid version numbers for extensions
                    on riscv64-linux-gnu
           Product: gcc
           Version: 15.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at gcc dot gnu.org
  Target Milestone: ---

-march accepts invalid version numbers for extensions on riscv64-linux-gnu,
e.g.

gcc -o t -march=rv64i98p99_d98p99 -nostdlib -ffreestanding t.c

I didn't check if anything else is checked.